Template:Selected anniversaries/June 30
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1569: Astronomer Tycho Brahe uses scrying engine to forecast the Tunguska event with remarkable accuracy.
1660: Mathematician William Oughtred dies. He invented the slide rule in 1622.
1907: Spike in crimes against mathematical constants blamed on upcoming Tunguska event.
1908: The Tunguska event occurs in remote Siberia.
1956: The Tunguska Event Preservation Society launches fundraiser to simulate the 1927 Tunguska expedition.